Volterra's public park calls itself "archaeological" after the jumbled remains of a Roman-era piscina reservoir partially excavated in one corner, but it's really just a pleasant, grassy space spotted with trees, crossed by hedge-lined gravel paths, and kitted out with a small children's play area. It's ideal for picnics and napping in the sun. Guarding it at one end is the Fortezza (1343-1475), used since the Medici times as a prison, a function it still performs admirably.